一步步打造简单的MVC电商网站BooksStore（2）_实用技巧_

 /// 
 /// 书籍详情视图模型 /// 
 public class BookDetailsViewModels : PagingInfo { public IEnumerable Books { get; set; } /// 
 /// 当前分类 /// 
 public string CurrentCategory { get; set; } } 

 /// 
 /// 详情 /// 
 /// 分类 /// 页码 ///  public ActionResult Details(string category, int pageIndex = 1) { var model = new BookDetailsViewModels { Books = _bookRepository.Books.Where(x => category == null || x.Category == category) .OrderBy(x => x.Id) .Skip((pageIndex - 1) * PageSize) .Take(PageSize), CurrentCategory = category, PageSize = PageSize, PageIndex = pageIndex, TotalItems = _bookRepository.Books.Count(x => category == null || x.Category == category) }; return View(model); } 

 namespace Wen.BooksStore.WebUI.Controllers { public class BookController : Controller { private readonly IBookRepository _bookRepository; public int PageSize = 5; public BookController(IBookRepository bookRepository) { _bookRepository = bookRepository; } /// 
 /// 详情 /// 
 /// 分类 /// 页码 ///  public ActionResult Details(string category, int pageIndex = 1) { var model = new BookDetailsViewModels { Books = _bookRepository.Books.Where(x => category == null || x.Category == category) .OrderBy(x => x.Id) .Skip((pageIndex - 1) * PageSize) .Take(PageSize), CurrentCategory = category, PageSize = PageSize, PageIndex = pageIndex, TotalItems = _bookRepository.Books.Count(x => category == null || x.Category == category) }; return View(model); } } } 

 @Html.PageLinks(Model, x => Url.Action("Details", new { pageIndex = x, category = Model.CurrentCategory })) 

 @model Wen.BooksStore.WebUI.Models.BookDetailsViewModels @{ ViewBag.Title = "Books"; } @foreach (var item in Model.Books) { 
@item.Name
 @item.Description 
@item.Price.ToString("C")

 } 
 @Html.PageLinks(Model, x => Url.Action("Details", new { pageIndex = x, category = Model.CurrentCategory })) 

 public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapRoute( name: "Default", url: "{controller}/{action}", defaults: new { controller = "Book", action = "Details" } ); routes.MapRoute( name: null, url: "{controller}/{action}/{category}", defaults: new { controller = "Book", action = "Details" } ); routes.MapRoute( name: null, url: "{controller}/{action}/{category}/{pageIndex}", defaults: new { controller = "Book", action = "Details", pageIndex = UrlParameter.Optional } ); } 

 public PartialViewResult Sidebar(string category = null) { var categories = _bookRepository.Books.Select(x => x.Category).Distinct().OrderBy(x => x); return PartialView(categories); } 

 @model IEnumerable
@Html.ActionLink("所有分类", "Details", "Book")
 @foreach (var item in Model) { 
@Html.RouteLink(item, new { controller = "Book", action = "Details", category = item, pageIndex = 1 }, new { @class = item == ViewBag.CurrentCategory ? "selected" : null })
 } 

 /// 
 /// 购物车 /// 
 public class Cart { private readonly List _cartItems = new List(); /// 
 /// 获取购物车的所有项目 /// 
 public IList GetCartItems => _cartItems; /// 
 /// 添加书模型 /// 
 ///  ///  public void AddBook(Book book, int quantity) { if (_cartItems.Count == 0) { _cartItems.Add(new CartItem() { Book = book, Quantity = quantity }); return; } var model = _cartItems.FirstOrDefault(x => x.Book.Id == book.Id); if (model == null) { _cartItems.Add(new CartItem() { Book = book, Quantity = quantity }); return; } model.Quantity += quantity; } /// 
 /// 移除书模型 /// 
 ///  public void RemoveBook(Book book) { var model = _cartItems.FirstOrDefault(x => x.Book.Id == book.Id); if (model == null) { return; } _cartItems.RemoveAll(x => x.Book.Id == book.Id); } /// 
 /// 清空购物车 /// 
 public void Clear() { _cartItems.Clear(); } /// 
 /// 统计总额 /// 
 ///  public decimal ComputeTotalValue() { return _cartItems.Sum(x => x.Book.Price * x.Quantity); } } 

 /// 
 /// 购物车项 /// 
 public class CartItem { /// 
 /// 书 /// 
 public Book Book { get; set; } /// 
 /// 数量 /// 
 public int Quantity { get; set; } } 

 @model Wen.BooksStore.WebUI.Models.BookDetailsViewModels @{ ViewBag.Title = "Books"; } @foreach (var item in Model.Books) { 
@item.Name
 @item.Description 
@item.Price.ToString("C")
 @using (Html.BeginForm("AddToCart", "Cart")) { var id = item.Id; @Html.HiddenFor(x => id); @Html.Hidden("returnUrl", Request.Url.PathAndQuery)  } 
 } 
 @Html.PageLinks(Model, x => Url.Action("Details", new { pageIndex = x, category = Model.CurrentCategory })) 

 body { } #header, #content, #sideBar { display: block; } #header { background-color: green; border-bottom: 2px solid #111; color: White; } #header, .title { font-size: 1.5em; padding: .5em; } #sideBar { float: left; width: 8em; padding: .3em; } #content { border-left: 2px solid gray; margin-left: 10em; padding: 1em; } .pager { text-align: right; padding: .5em 0 0 0; margin-top: 1em; } .pager A { font-size: 1.1em; color: #666; padding: 0 .4em 0 .4em; } .pager A:hover { background-color: Silver; } .pager A.selected { background-color: #353535; color: White; } .item input { float: right; color: White; background-color: green; } .table { width: 100%;
                
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